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🔔 Subscribe to Our ChannelWhat is the Mapper Design Pattern?
The Mapper Design Pattern falls under the base patterns category in enterprise application architecture. In simple terms, a Mapper is an object that sets up communication between two independent objects or subsystems.
When two independent subsystems need to talk to each other, modifying either one directly creates tight coupling and breaks independence. Introducing a Mapper acts as an insulating layer in between, enabling seamless data transfer without modifying either subsystem.
How Does a Mapper Work?
The Mapper sits directly between two standalone components:
- Subsystem 1 & Subsystem 2: Both subsystems remain completely unaware of each other's internal structure and implementations.
- Data Shuffling: The Mapper takes data from one layer, transforms or adapts it, and delivers it to the target layer.
- Zero Direct Coupling: Neither subsystem needs to be modified when changes occur in the other subsystem; only the mapper logic is adjusted.
Common Types of Mappers
Depending on the architectural need, mappers come in different specialized forms:
- Data Mapper: One of the most popular mappers, bridging relational data sources to in-memory business domain models.
- Protocol Mapper: Converts communication protocols between disparate systems.
- Schema Mapper: Maps distinct database or messaging schemas.
- Interface Mapper: Bridges differing interface contracts.
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